audio link Re: Peer Discovery

Richard Franks spontificus at
Mon Dec 11 22:28:09 CET 2006

On 12/11/06, Robert Michel <openmoko at> wrote:
> > > 10 bonus points if it sounds like R2D2.
> efficient data transmission via audio mustn't sound well
> for the user - DTMF for transmitting your phonenumber
> would be acceptable, but the other modulations?

Heh! That idea was intended just for handshaking/swapping business
cards - very small amounts of data. Hands up who wouldn't sacrifice a
little speed, for a phone that shared business cards with a fellow
Neo1973 with cute 'threeps' and 'twerps'?

> To beem your virtual business card via audio it would be
> nice when the data transmission would be encoded into
> a non uggly modification of a voice output:
> "I'm beaming you now my virtual buseness card - complete"

Or multiplexing a higher frequency data signal, if the hardware supports it?

> Such a solution could be also run on other smartphones with
> java - send and receive business cards and more without
> Bluetooth or IRDA nor cable nor online connections.

I wonder if it's possible to support the basic modem signalling
protocol in software? I haven't touched anything like that, but if for
the price of a local phonecall and an old PCI modem, I could call a PC
and encrypt whatever I liked through that connection.. it could end up
being a cheaper, secure, alternative than GPRS?


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